Well I am unsure about an outside solution (medication, therapy) for this issue. And yes, I find myself at times being such a person. It horrifies me afterward.

I'd like to know how often you find yourself in situations with other people, socially, work, or otherwise. I know in my own case that such situations (my gabbing at length) seem to arise during periods I have been alone. It is as though I am bubbling with the need to finally talk when the opportunity arises.

How do I manage with this? I have a signal I have agreed upon with several acquaintances. If I am in public with them and start to talk incessantly they give me that signal so I can take heed and slow down. I have noticed too the more I write my thoughts and feelings down the less I have a need to discuss them with others. Finally, and I know this sounds a bit crazy, I rehearse conversations I know are likely to arise. I at times them have a script to follow when they do.